inste of doing this to change to permissin I've checked that those files had the not right owner.
Then I've only make this :
chown asterisk:asterisk extensions_additional.conf extensions_pluto_dial.conf iax_additional.conf iax_registrations.conf meetme_additional.conf provider_list.txt queues_additional.conf sccp.conf sccp.conf.template sip_additional.conf sip_registrations.conf zapata_additional.conf
The problem was that this files had root.root as owner and not the asterisk user and group, like FreePBX web interface would like to use.
Next when I make every changes in configuration and then apply config, don't ever receive the error message and all works great.